Pen



FIG. 1 is a front view of a first embodiment of a pen showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof, the left side being a mirror image;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view of a second embodiment thereof;

FIG. 7 is a rear view thereof;

FIG. 8 is a right side view thereof, the left side being a mirror image;

FIG. 9 is a top view thereof;

FIG. 10 is a bottom view thereof;

FIG. 11 is a front view of third embodiment thereof;

FIG. 12 is a rear view thereof;

FIG. 13 is a right side view thereof, the left side being a mirror image;

FIG. 14 is a top view thereof; and,

FIG. 15 is a bottom view thereof. 

The ornamental design for a pen, as shown and described. 